OpenAI, the artificial intelligence firm originally founded by Elon Musk and Y Combinator’s Sam Altman, just landed a $1 billion investment from Microsoft.

Though originally founded to be a non-profit, ethical alternative to the massive companies developing AI tech, OpenAI became a sort of hybrid non-profit and for-profit back in March. The two companies have been collaborating on projects for years, but now with this new investment, Business Insider reports that OpenAI will be developing AI tech specifically for Microsoft’s cloud services.